Thanks for reply Paul.
but few competitors are still using 3rd party reviews with markup code and coming rich snippets in Google successfully. For example below are the few competitor currently using.
Competitor 1: https://goo.gl/Dq7tMn [1453 reviews - from 3rd party]
Competitor 2: https://goo.gl/YzdK2v [1453 reviews - from 3rd party]
Below is the Google SERP link for this keyword [Eurocalas Aparthotel] and you can see both competitors are coming with Rich Snippet
Google SERP: https://goo.gl/vfvZat [you can see both competitors with rich snippet]
Kindly let me know you feed back on these competitor links.
Thanks,
Satla